CN203352431U - Low-frequency ripple inhibition circuit and DC/DC converter - Google Patents
Low-frequency ripple inhibition circuit and DC/DC converter Download PDFInfo
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- CN203352431U CN203352431U CN 201320353021 CN201320353021U CN203352431U CN 203352431 U CN203352431 U CN 203352431U CN 201320353021 CN201320353021 CN 201320353021 CN 201320353021 U CN201320353021 U CN 201320353021U CN 203352431 U CN203352431 U CN 203352431U
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Abstract
The utility model discloses a low-frequency ripple inhibition circuit and a DC/DC converter. The low-frequency ripple inhibition circuit comprises an output voltage sampling loop. The output voltage sampling loop comprises a shunting reference source with three adjustable ends. A voltage reference diode is serially connected between the anode of the shunting reference source with three adjustable ends and an output ground. By using the low-frequency ripple inhibition circuit, the DC/DC converter can keep electrical performance indexes and further simply and effectively achieve inhibition of low-frequency ripples in output ripples. The interference from the low-frequency ripples in the output ripple voltage of the DC/DC converter is prevented. The low-frequency ripple inhibition circuit is suitable for various DC/DC converter circuit topologies.
Description
Technical field
The utility model relates to the commander of electronic engineering territory, relates in particular to a kind of low-frequency ripple suppression circuit and DC/DC converter.
Background technology
Along with the development of electronic engineering system miniaturization technology, increasing electric power system starts the distributed power supply design that adopts the DC/DC supply convertor to form, and replaces traditional power supply centralized power supply system be comprised of discrete component.The output ripple voltage of DC/DC converter is one of important indicator of its output characteristic, and the size of output ripple voltage has reflected the how appropriate of DC/DC converter in the electronic engineering system.
Low-frequency ripple is the low frequency part in the output ripple voltage of DC/DC converter, is mainly derived from the power supply of DC/DC converter and the switch change-over of DC/DC converter self.Low-frequency ripple is that capacity with topological structure, closed loop gain, no-load voltage ratio and the output capacitance of DC/DC converter etc. is closely related.Can reduce to a certain extent low-frequency ripple by the capacity of adjusting topological structure, closed loop gain, no-load voltage ratio and increase output capacitance, but the low-frequency ripple of output still can be larger, there is the possibility that can affect the work of electronic engineering system, so in the urgent need to a kind of simple and effective low-frequency ripple suppression circuit of applicable various circuit topologies, the DC/DC converter is applied better in the electronic engineering system.
The utility model content
The purpose of this utility model is to provide a kind of low-frequency ripple suppression circuit and DC/DC converter, the low-frequency ripple inhibition problem existed in order to solve existing DC/DC converter.
In order to solve the problems of the technologies described above, the utility model provides a kind of low-frequency ripple suppression circuit, it is for the DC/DC converter, and described low-frequency ripple suppression circuit comprises the output voltage sampling circuit, and described output voltage sampling circuit comprises three end adjustable shunt reference sources.Be in series with a voltage reference diode between the anode of described three end adjustable shunt reference sources and output ground.
In the utility model one better embodiment, described output voltage sampling circuit also comprises first electric capacity, second electric capacity, first resistance, second resistance, the 3rd resistance, the 4th resistance and a light-emitting diode, described the first electric capacity and described the first resistance parallel connection, described the second electric capacity and described the second resistance series connection, described the 3rd resistance and described the 4th resistance are connected and are connected between output positive voltage and output ground, the negative electrode of described three end adjustable shunt reference sources connects the negative electrode of described light-emitting diode, described three end adjustable shunt reference sources, described light-emitting diode and described the first capacitances in series also are connected in the output positive voltage and export between ground, the reference edge of described three end adjustable shunt reference sources is connected in the negative electrode of described light-emitting diode by described the second electric capacity and described the second resistance, the reference edge of described three end adjustable shunt reference sources also is connected between described the 3rd resistance and described the 4th resistance, the anode of described three end adjustable shunt reference sources connects the anode of described voltage reference diode.
In the utility model one better embodiment, the anode of described voltage reference diode is connected with reference edge and connects the anode of described three end adjustable shunt reference sources, and the negative electrode of described voltage reference diode connects output ground and connects described the 4th resistance.
The utility model provides a kind of DC/DC converter in addition, and described DC/DC converter is containing above-mentioned low-frequency ripple suppression circuit.
With respect to prior art, the low-frequency ripple suppression circuit that utilizes the utility model to provide, the DC/DC converter both can keep electrical performance indexes, can realize simply and effectively the inhibition to output ripple medium and low frequency ripple again, the low-frequency ripple solved in DC/DC converter output ripple voltage disturbs, and is applicable to various DC/DC converter circuit topologys.
The accompanying drawing explanation
In order to be illustrated more clearly in the technical solution of the utility model, below will the accompanying drawing of required use in embodiment be briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of the low-frequency ripple suppression circuit that provides of the utility model one preferred embodiment.
Fig. 2 is that push-pull topology adopts the forward and backward output low frequency ripple comparison diagram of low-frequency ripple suppression circuit shown in Fig. 1;
Fig. 3 is that forward topology adopts the forward and backward output low frequency ripple comparison diagram of low-frequency ripple suppression circuit shown in Fig. 1.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
Refer to Fig. 1, a kind of low-frequency ripple suppression circuit that the utility model one preferred embodiment provides, it is for the DC/DC converter, described low-frequency ripple suppression circuit comprises the output voltage sampling circuit, described output voltage sampling circuit comprises three end adjustable shunt reference source U1, between the anode of described three end adjustable shunt reference source U1 and output ground, is in series with a voltage reference diode U2.
In the present embodiment, described output voltage sampling circuit also comprises first capacitor C 1, one the second capacitor C 2, one the first resistance R 1, one the second resistance R 2, the 3rd resistance R 3X, the 4th a resistance R 4X and a light-emitting diode OP1.Described the first capacitor C 1 and described the first resistance R 1 parallel connection; Described the second capacitor C 2 and described the second resistance R 2 series connection; Described the 3rd resistance R 3X and described the 4th resistance R 4X series connection, and be connected between output positive voltage and output ground.The negative electrode of described three end adjustable shunt reference source U1 connects the negative electrode of described light-emitting diode OP1; Described three end adjustable shunt reference source U1, described light-emitting diode OP1 and described the first capacitor C 1 are connected and are connected between output positive voltage and output ground; The reference edge of described three end adjustable shunt reference source U1 is connected in the negative electrode of described light-emitting diode OP1 by described the second capacitor C 2 and described the second resistance R 2, the negative electrode of the reference edge of described three end adjustable shunt reference source U1, described the second capacitor C 2, described the second resistance R 2 and described three end adjustable shunt reference source U1 forms a loop; The reference edge of described three end adjustable shunt reference source U1 also is connected between described the 3rd resistance R 3X and described the 4th resistance R 4X; The anode of described three end adjustable shunt reference source U1 connects the anode of described voltage reference diode U2.The anode of described voltage reference diode U2 is connected with reference edge and connects the anode of described three end adjustable shunt reference source U1, and the negative electrode of described voltage reference diode U2 connects output ground and meets described the 4th resistance R 4X.
Refer to Fig. 2 and Fig. 3, Fig. 2 is that push-pull topology adopts the forward and backward output low frequency ripple comparison diagram of described low-frequency ripple suppression circuit, Fig. 3 is that forward topology adopts the forward and backward output low frequency ripple comparison diagram of described low-frequency ripple suppression circuit, the sine wave that wherein low-frequency ripple of input is frequency 800Hz, amplitude 500mV.Known, described low-frequency ripple suppression circuit can effectively be realized the inhibition of low-frequency ripple in DC/DC converter circuit topology.
The present embodiment a kind of DC/DC converter is provided on the other hand, it comprises low-frequency ripple suppression circuit as above, except low-frequency ripple suppression circuit, the DC/DC converter also can comprise other conventional parts, does not repeat them here.
With respect to prior art, the low-frequency ripple suppression circuit that utilizes the utility model to provide, the DC/DC converter both can keep electrical performance indexes, can realize simply and effectively the inhibition to output ripple medium and low frequency ripple again, the low-frequency ripple solved in DC/DC converter output ripple voltage disturbs, and is applicable to various DC/DC converter circuit topologys.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.
Claims (4)
1. a low-frequency ripple suppression circuit, it is for the DC/DC converter, described low-frequency ripple suppression circuit comprises the output voltage sampling circuit, described output voltage sampling circuit comprises three end adjustable shunt reference sources, it is characterized in that, between the anode of described three end adjustable shunt reference sources and output ground, be in series with a voltage reference diode.
2. low-frequency ripple suppression circuit as claimed in claim 1, it is characterized in that, described output voltage sampling circuit also comprises first electric capacity, second electric capacity, first resistance, second resistance, the 3rd resistance, the 4th resistance and a light-emitting diode, described the first electric capacity and described the first resistance parallel connection, described the second electric capacity and described the second resistance series connection, described the 3rd resistance and described the 4th resistance are connected and are connected between output positive voltage and output ground, the negative electrode of described three end adjustable shunt reference sources connects the negative electrode of described light-emitting diode, described three end adjustable shunt reference sources, described light-emitting diode and described the first capacitances in series also are connected in the output positive voltage and export between ground, the reference edge of described three end adjustable shunt reference sources is connected in the negative electrode of described light-emitting diode by described the second electric capacity and described the second resistance, the reference edge of described three end adjustable shunt reference sources also is connected between described the 3rd resistance and described the 4th resistance, the anode of described three end adjustable shunt reference sources connects the anode of described voltage reference diode.
3. low-frequency ripple suppression circuit as claimed in claim 2, it is characterized in that, the anode of described voltage reference diode is connected with reference edge and connects the anode of described three end adjustable shunt reference sources, and the negative electrode of described voltage reference diode connects output ground and connects described the 4th resistance.
4. a DC/DC converter, is characterized in that, described DC/DC converter comprises low-frequency ripple suppression circuit as described as claim 1～3 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320353021 CN203352431U (en) | 2013-06-14 | 2013-06-14 | Low-frequency ripple inhibition circuit and DC/DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320353021 CN203352431U (en) | 2013-06-14 | 2013-06-14 | Low-frequency ripple inhibition circuit and DC/DC converter |
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| Publication Number | Publication Date |
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| CN203352431U true CN203352431U (en) | 2013-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320353021 Expired - Lifetime CN203352431U (en) | 2013-06-14 | 2013-06-14 | Low-frequency ripple inhibition circuit and DC/DC converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427612A (en) * | 2013-06-14 | 2013-12-04 | 深圳市振华微电子有限公司 | Low frequency ripple suppression circuit and DC/DC converter |
-
2013
- 2013-06-14 CN CN 201320353021 patent/CN203352431U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427612A (en) * | 2013-06-14 | 2013-12-04 | 深圳市振华微电子有限公司 | Low frequency ripple suppression circuit and DC/DC converter |
| CN103427612B (en) * | 2013-06-14 | 2016-12-28 | 深圳市振华微电子有限公司 | Low-frequency ripple suppression circuit and DC/DC changer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wan Bangwei Inventor after: Sun Yuanpeng Inventor after: Fang Xianhua Inventor after: Qin Yangbo Inventor before: Wan Bangwei Inventor before: Sun Yuanpeng Inventor before: Fang Xianhua Inventor before: Qin Yangbo |